Keyboard



FIG. 1 is a perspective front side view of a keyboard showing our new design;

FIG. 2 is a perspective rear side view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a left side elevation view thereof; and,

FIG. 8 is a right side elevation view thereof.

Broken lines in the drawings depict portions of the keyboard that form no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 